Improvement in chimney-caps



W. S. BURCH.

Chimney Top. No. 4,631. i v Patentedjluly 14.- I846.

N. PiTERS. mwmw w. Walhinkm no UNITED STATES PATENT OFFICE.

IVILLIAM S. BURCH, OF WASHINGTON, DISTRICT OF COLUMBIA.

IMPROVEMENT IN CHIMNEY-CAPS.

Specification forming part of Letters Patent No. 4,631, dated July 14, 1846.

To all whom it may concern.-

Be it known that 1, WILLIAM S. BURCH, of WVashington, in the county of Washington and District of Columbia, have invented a new and useful Improvement in Ohimney- Tops; and I do hereby declare that the following is a full, clear, and exact description of the principle or character thereof which distinguishes my invention from all other things before known, and of the manner of making, constructing, and using the same, reference being had to the accompanying drawings, making part of this specification, in Which- Figure 1 is a side elevation, and Fig. 2 a vertical section, of the same.

The same letters indicate like parts in all the figures.

The great difficulty heretofore experienced in the construction of chimney-caps has been to prevent smoking in any state of the atmosphere. Several caps have been found efficacious in windy weather, but are worse than nothing if applied to the top of a chimney in a calm, and at such times actually impede the draft. Others again may answer in certain states of the Weather, but not in others. By my improvement I can cure the worst case of smoky chimneys and in all states of the weather.

The construction is as follows: On the top of any ordinary chimney I affix a square base a, that is made just to fit said chimney. This base has a top to it having a round hole cut out of it, into which is fitted a tube b, that rises to a suitable height for the purpose intended. This -tube may be slightly conical, and has two bars 0 extending across it at right angles to each other, one being placed near the top and the other near the bottom. These bars support a vertical rod d, that is .firmly fixed to them at the center of the tube.

Over the tube 1) above named loosely fits a cylindrical tube e, to which is affixed a truncated. conical tube f, the last-named tube intersecting tube e at an angle of about fortyfive degrees, the smallest end beingdownward. These two tubes form the revolving cap which is supported on and turns around the rod or spindle d.

On the upper or largest end of tube f a Wing or vane g is fixed, which keeps that end pointing always in the direction of the wind. When there is a current of air, it flows into the small end of the tube (which is open) and is thence directed upward and out at the large end, thus aiding the column of air in the chimney to rise; but if there is no air stirring the heat of the fire readily causes a similar current through the pipes without having the draft of the chimney in any way impeded, and the cure of the chimney is thus permanently and efiectually attained.

Having thus fully described my improved cap and its mode of operation, I wish it to be understood that I do not claim as new the application of conical caps to the tops of chimneys in many different ways; but

What I do claim as my invention, and desire to secure by Letters Patent, is

The combination of the inclined conical tube with the revolving chimney-cap, substantially in the manner and for the purpose herein set forth.

WILLIAM S. BURCH. Witnesses:

A. P. BROWER, JEREMIAH DARLING. 

